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		<title>three.js - WebGPU - Sandbox</title>
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			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> WebGPU - Sandbox<br/>(Chrome Canary with flag: --enable-unsafe-webgpu)
		</div>

		<script type="importmap">
		{
			"imports": {
				"three": "../build/three.module.js"
			}
		}
		</script>
		<script type="module">

			import * as THREE from 'three';

			import { DDSLoader } from './jsm/loaders/DDSLoader.js';

			import WebGPURenderer from './jsm/renderers/webgpu/WebGPURenderer.js';
			import WebGPU from './jsm/renderers/webgpu/WebGPU.js';

			import * as Nodes from './jsm/renderers/nodes/Nodes.js';

			let camera, scene, renderer;

			let box;

			init().then( animate ).catch( error );

			async function init() {

				if ( WebGPU.isAvailable() === false ) {

					document.body.appendChild( WebGPU.getErrorMessage() );

					throw 'No WebGPU support';

				}

				camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.1, 10 );
				camera.position.z = 4;

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0x222222 );

				// textures

				const textureLoader = new THREE.TextureLoader();
				const texture = textureLoader.load( './textures/uv_grid_opengl.jpg' );
				texture.wrapS = THREE.RepeatWrapping;
				texture.wrapT = THREE.RepeatWrapping;
				texture.name = 'uv_grid';

				const textureDisplace = textureLoader.load( './textures/transition/transition1.png' );
				textureDisplace.wrapS = THREE.RepeatWrapping;
				textureDisplace.wrapT = THREE.RepeatWrapping;

				// compressed texture

				const ddsLoader = new DDSLoader();
				const dxt5Texture = ddsLoader.load( './textures/compressed/explosion_dxt5_mip.dds' );

				// box mesh

				const geometryBox = new THREE.BoxGeometry();
				const materialBox = new Nodes.MeshBasicNodeMaterial();

				const timerNode = new Nodes.TimerNode();

				// birection speed
				const timerScaleNode = new Nodes.OperatorNode( '*', timerNode, new Nodes.Vector2Node( new THREE.Vector2( - 0.5, 0.1 ) ).setConst( true ) );
				const animateUV = new Nodes.OperatorNode( '+', new Nodes.UVNode(), timerScaleNode );

				const textureNode = new Nodes.TextureNode( texture, animateUV );

				materialBox.colorNode = new Nodes.MathNode( 'mix', textureNode, new Nodes.CheckerNode( animateUV ), new Nodes.FloatNode( .5) );

				// test uv 2
				//geometryBox.setAttribute( 'uv2', geometryBox.getAttribute( 'uv' ) );
				//materialBox.colorNode = new TextureNode( texture, new UVNode( 1 ) );

				box = new THREE.Mesh( geometryBox, materialBox );
				box.position.set( 0, 1, 0 );
				scene.add( box );

				// displace example

				const geometrySphere = new THREE.SphereGeometry( .5, 64, 64 );
				const materialSphere = new Nodes.MeshBasicNodeMaterial();

				const displaceAnimated = new Nodes.SplitNode( new Nodes.TextureNode( textureDisplace ), 'x' );
				const displaceY = new Nodes.OperatorNode( '*', displaceAnimated, new Nodes.FloatNode( .25 ).setConst( true ) );

				const displace = new Nodes.OperatorNode( '*', new Nodes.NormalNode( Nodes.NormalNode.LOCAL ), displaceY );

				materialSphere.colorNode = displaceY;
				materialSphere.positionNode = new Nodes.OperatorNode( '+', new Nodes.PositionNode( Nodes.PositionNode.LOCAL ), displace );

				const sphere = new THREE.Mesh( geometrySphere, materialSphere );
				sphere.position.set( - 2, - 1, 0 );
				scene.add( sphere );

				// data texture

				const geometryPlane = new THREE.PlaneGeometry();
				const materialPlane = new Nodes.MeshBasicNodeMaterial();
				materialPlane.colorNode = new Nodes.OperatorNode( '+', new Nodes.TextureNode( createDataTexture() ), new Nodes.ColorNode( new THREE.Color( 0x0000FF ) ) );
				materialPlane.opacityNode = new Nodes.SplitNode( new Nodes.TextureNode( dxt5Texture ), 'a' );
				materialPlane.transparent = true;

				const plane = new THREE.Mesh( geometryPlane, materialPlane );
				plane.position.set( 0, - 1, 0 );
				scene.add( plane );

				// compressed texture

				const materialCompressed = new Nodes.MeshBasicNodeMaterial();
				materialCompressed.colorNode = new Nodes.TextureNode( dxt5Texture );
				materialCompressed.transparent = true;

				const boxCompressed = new THREE.Mesh( geometryBox, materialCompressed );
				boxCompressed.position.set( - 2, 1, 0 );
				scene.add( boxCompressed );

				// points

				const points = [];

				for ( let i = 0; i < 1000; i ++ ) {

					const point = new THREE.Vector3().random().subScalar( 0.5 );
					points.push( point );

				}

				const geometryPoints = new THREE.BufferGeometry().setFromPoints( points );
				const materialPoints = new Nodes.PointsNodeMaterial();

				materialPoints.colorNode = new Nodes.OperatorNode( '*', new Nodes.PositionNode(), new Nodes.FloatNode( 3 ).setConst( true ) );

				const pointCloud = new THREE.Points( geometryPoints, materialPoints );
				pointCloud.position.set( 2, - 1, 0 );
				scene.add( pointCloud );

				// lines

				const geometryLine = new THREE.BufferGeometry().setFromPoints( [
					new THREE.Vector3( - 0.5, - 0.5, 0 ),
					new THREE.Vector3( 0.5, - 0.5, 0 ),
					new THREE.Vector3( 0.5, 0.5, 0 ),
					new THREE.Vector3( - 0.5, 0.5, 0 )
				] );

				geometryLine.setAttribute( 'color', geometryLine.getAttribute( 'position' ) );

				const materialLine = new Nodes.LineBasicNodeMaterial();
				materialLine.colorNode = new Nodes.AttributeNode( 'color', 'vec3' );

				const line = new THREE.Line( geometryLine, materialLine );
				line.position.set( 2, 1, 0 );
				scene.add( line );

				//

				renderer = new WebGPURenderer( { requiredFeatures: [ 'texture-compression-bc' ] } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				document.body.appendChild( renderer.domElement );

				window.addEventListener( 'resize', onWindowResize );

				return renderer.init();

			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function animate() {

				requestAnimationFrame( animate );

				box.rotation.x += 0.01;
				box.rotation.y += 0.02;

				renderer.render( scene, camera );

			}

			function createDataTexture() {

				const color = new THREE.Color( 0xff0000 );

				const width = 512;
				const height = 512;

				const size = width * height;
				const data = new Uint8Array( 4 * size );

				const r = Math.floor( color.r * 255 );
				const g = Math.floor( color.g * 255 );
				const b = Math.floor( color.b * 255 );

				for ( let i = 0; i < size; i ++ ) {

					const stride = i * 4;

					data[ stride ] = r;
					data[ stride + 1 ] = g;
					data[ stride + 2 ] = b;
					data[ stride + 3 ] = 255;

				}

				return new THREE.DataTexture( data, width, height, THREE.RGBAFormat );

			}

			function error( error ) {

				console.error( error );

			}

		</script>
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